Ingenieurwissenschaften und zugeordnete Tätigkeiten
Filtern
Erscheinungsjahr
- 2016 (1)
Dokumenttyp
- Vortrag (1)
Sprache
- Deutsch (1) (entfernen)
Referierte Publikation
- nein (1)
Schlagworte
- High strength steel (1)
- Split Hopkinson pressure bar (1)
- Welding (1)
Eingeladener Vortrag
- nein (1)
The use of high-strength steels is wide spread in vehicle and crane manufacturing due to light weight reasons. These steels are used for impact of crash loaded components and therefore it is important to investigate high-strength welds at dynamic impact. Investigations of welds at high strain rates have been rarely conducted in the past.
To determine the dynamic impact behaviour of hybrid laser-arc welds, the Split Hopkinson Pressure Bar (SHPB) technique was used. The base material was a quenched and tempered fine-grained structural steel with yield strength of 1100 MPa. The influence of two variables, cooling time t8/5 and strength of filler material, on the impact behaviour was studied. A matching and an under matching filler material were used. The cooling time t8/5 was varied to influence the microstructure in the heat affected zone (HAZ) and to analyse the effect on hardening and softening. Hardness measurements and optical microscopy was used to analyse the weld microstructure before and after the SHPB test. The investigations showed a correlation between the overall hardness of the weld, influenced by filler material and cooling time, on the maximum stress level during dynamic impact.